html,
body,
h1,
h2,
h3,
p,
div,
span,
img,
ul,
li,
ol,
dl,
dt,
dd,
input,
a,
form,
textarea,
section,
header,
footer,
article,
aside,
nav {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

h1 {
    font-size: 0;
}

ul,
ol,
li {
    list-style: none;
}

body {
    font-size: 12px;
    font-family: "微软雅黑";
}

input,
textarea {
    outline: none;
}

textarea {
    resize: none;
}

h1,
h2,
h3,
h4 {
    font-weight: normal;
}

.clearfix::after {
    content: "";
    overflow: hidden;
    clear: both;
    visibility: hidden;
    font-size: 0;
    height: 0;
    display: block;
}